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(2x+1)(x-7)
x1=(-1/2) dan x2=7
x2>x1 maka
2x1+3x2=2(-1/2)+3*7=(-1)+21=20 D
(2x + 1) (x - 7) .
x¹ = 2x + 1
= x = ½
x² = x - 7
= x = 7
Maka nilai dari
2x¹ + 3x² = 2.(½) + 3.(7)
= 2/2 + 21
= 1 + 21 = 22 (e)